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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385756e46eee9ad3d00db5c60decfadbba5b152a205e3abf664ac8d117ac1b0b' 
  AND token = '9rCgax6AEyJhhxHL2ZrRfmu/VkRHUIB9TflapGKRCw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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