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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff7ae836de04b395a030db793cebb46b9bc0ebcb1f90d7a9874543b30407503' 
  AND token = 'ToRdtGGtRIAE5Q67O4OV3jZ0aTwBkI7mVrJpqhh3z/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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