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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6f8edabba7b7208b9477f5f9667870ef72eee39c316dba651f52f79469015a' 
  AND token = 'ba7qDv2yyPHRREu+1H4PI2fyhw5SZRPYnNR4FqBwtOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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