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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd973cd934c60e4b8fbf2080750240aa9be979b6c7edd73ad26de104b11d2958f' 
  AND token = 'KGndQdB3Li243iRpNkWa1H2F7mSA4u7hf8oD71F4ABY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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