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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810755251603104264e9a038d5b82702c6ee45280fd2ac51065fb3a7b2c5bb17' 
  AND token = 'NJWat0RoUYICCInxfIQjZBwSU5wd++dxnaPlKTA6zv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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