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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048d99f5126a79b7f7d684e77f7da0780ef4822b04ab0bcdef9e79a11cc8a27b' 
  AND token = 'jVaMJw53K0Ns6MFiktYTICo15pXrwNo8gMaDM0oAmKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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