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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9300500c4b78f1e7dde06e1837151b9fd0aafef1bc7fc67407cc57dd9e7313b' 
  AND token = 'FF8FXuM8iJ5iXPcZJU4/I2woRP8RDVdTJRggiOCyjZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}