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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b95b730898ad6e5dfab177ba4d8a2a340a72859ea98c890f97877ab51ab0573' 
  AND token = 'oaM2CumDmWPDF7QX/ORAmhWAk5EBLIkBNDRW7LlIb3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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