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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0841f150b7e130a111b95a4c74aeb93a230986491696c5283b96a1a949b5ea4b' 
  AND token = 'q0GHxPO/eEj3S7ZSm2Lr4kREjTPLuyxAWg3KnlvR5vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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