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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc95b1a8fae3edd2e21d715cf1590268522800aae805c2be756c725de0f3b288' 
  AND token = 'barnVZ19BJjUhYJRVAWtYuJ/Hh/U65il/b0ziVRKJWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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