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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806c67f5bfdf330684983e69bc465eaf617ae554cebfcb7184b3760ec8cd1ae8' 
  AND token = '9m+UlVt8ICVxuDsxsJ1xKuhb5MeDJsUl5aqWJL+0vmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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