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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471a084688e912331a7b2d665a6f767c643022a759811a9a210238542467b1ae' 
  AND token = 'VbVSle26/DSjJjhy+N5Pi43vQOWtwdfHhfQgy3soikQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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