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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23177f5580dae97efca01e781ff28048e1ebbca0fee276663a5b4bae4eaa71e6' 
  AND token = '1TG4k7Qvhnt7kJBP8GjBsFK6DnBd1Nh4rcfqsr8zElI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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