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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d653ccf32f2ba9495cc60a24d8e321c61ec1d89c71ccc8d81644984a581b73f' 
  AND token = 'M+yJlM1n/7/utiqDgHurnr/TLnaoepc7qBdSPYDkWEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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