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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63adcda4ba8306e232059d28422bb0e5e9cfbde0a7f2782ce351b4a19b026c27' 
  AND token = '61U7JBi/LoNMzCXb9WNFqJRArofNI1sVZ4IuR82PNVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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