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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2ec2d6d82962df123ae6d7f5b46ab0e3a83bf4f4d2bdfdf644616e1dc9d875' 
  AND token = 'UfwJDYilKmYfEGz3byaGQ+frkZyZ1huY1WU0qL6MZUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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