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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efe77f7f4dc04bee4b5db461f6a3db2b1d2388aac5227ec1f9f3bc379f4ae9f' 
  AND token = 'n1Cv2SZ3heXvcM0+d2e7SA88Mdv9yXvRyIeAd+ijvgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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