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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253254511583ef1bc65e96f1cabe20b55b0fd3efd8be73ef615393338bd5b599' 
  AND token = '75g4z5sC6tcnqNcaPM3gE8BN+9p0BicGZxXxKPXSc4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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