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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6360982bb2b085558124493ff87ec33e90a42bac1b7010d02f637eb69d41876e' 
  AND token = 'JAQ/Q4TDwFk0ED7P+UYN2hQW+uTYFqAIedgF5FrMn/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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