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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7927a99e46899189c03e2d4ba33efe6e5393683d04239b5b536e1861edb76d23' 
  AND token = 'rr0REtt6A/gTul6P+GodZaDDqaFEXlwJSvk9q/2wBoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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