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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a823a1518069c7cbf62884594c5231278ac36337aff1aadd4c5388d6a32dceb7' 
  AND token = 'oaoXVvokCbWq7/mrSIKJVc0WVx+OMgUAci3TJI6Acjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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