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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14225b79e2f635222e74bcd3b0de004dfbd12916729953a7cdd85286960fa9ea' 
  AND token = 'D5fnpCsZSBR3XJjZJz+Yodbr/2mutnoa6a9/J/AGSv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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