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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de1499058d5dfb5c501702b7ecafa9209222cc8bd03075d0d07d07712761566' 
  AND token = 'YTM0l0sxsFrAjofy9FnFhw0d/vI2N5q8eYpSvU8GCcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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