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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a7a8b2ebb467ddb2a1ff43d7ab71a65bfe73e8720bee6d60933f1e6cad1186' 
  AND token = '1Lo5DD+dyM5rvNNCDzC2GwZp9LFHlZ6Aw5NvY8VjlCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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