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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3eba15ebf35d655fd9c0aa2be33f95a8801de8f5f248be4c024cda7d3b86654' 
  AND token = 'Q3egwfBomoYIuge1l77U3kLqsbbFbhJrYa5mTHc2NRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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