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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90969428ea441d459282ee00af92e47ccbf093f76ce053095ed534e184d0ad2a' 
  AND token = '+WRL1HwkNlLAKq/dv7A5T5zPiVDT2tSgZCvQZszV2ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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