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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67da736c3d9366b8db351654e10158792b601fdad67835a7935f81036f68b5d4' 
  AND token = 'mrLsPlxwbPc1yS/c5ZL7XoizGXdVXuTHb7Es7W7tlUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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