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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b36282ff6678c3cd3230e94fcae2debd3b7588f04f21c239c97013866727072' 
  AND token = 'psw7bxYpPBWA/vSGml+Br4HTvr9GKOB2tpZidX87yI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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