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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b130110577fb90355b4faeb46c821621a3c1beac5edab2e64953ec83ec6be1' 
  AND token = '2mJxpAF2kNo8NqAaN6Rwk5/GZ6OZapnWvgHGE1SCQ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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