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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30e9ec8fbdd50c763cbc5d61de0c6aff87e40bce0bcf57585d0c7d4856cf496' 
  AND token = 'QZW/Inma9Le0w3NCUZ8ns5QSQwMMvvWjEUJcvdgyIic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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