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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec39a77bbc5f2ab26faea2de546c716d838a2cb0a1c159a94db545d42d022742' 
  AND token = '2AeVAw8bek4tPNrX+cpVux2hQqDqnk2Gn098bpi5hcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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