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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6063dce08332ac51f89ee97b7512c7a40346a41ef2e2d70823077978502d893' 
  AND token = 'NydMtR18Af9kLKWhZhEC490THiBjHOVitli86MR1Z9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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