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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b330d84e265d4cc2073aaf571948d61980c24bdded2c14434964ed792f4d83b' 
  AND token = 'IpdDsIubOG/ntlCdzaiOJxCrZ4w3qs8hrWCv/7texzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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