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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4223cca378f4001cba466dab6bd9354d71892555d32568d4723336f71a66c7ca' 
  AND token = 'dJ4YbdunOu2iykJx1TaCUOajsHqq37zVQBqqm+Bh7NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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