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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90e4898127c13c5c1dad1b5167db9037986a0efc3bb30d5c643f6c31b09b7af' 
  AND token = 'LVfkhch2R6M+4FnenkLWDOdOSv+ZRNosp3mBVp2WL6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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