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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5b2457bb0d905ed0f8492551be6e350ee7b7b94147ffdd6a3ad7b39e69b982' 
  AND token = 'I+Cyfa9uz/ltXZt0E+zH81NsUUT9oa//t8W9+OJdC7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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