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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2167e131720c2519f9d8ef82fd3f41068d3a343f1ba2919f12cfbb5465ada85' 
  AND token = 'LUl7yZcNs/X8kJy6Zt7VT10iWCnZPuLZku3WBRnPVtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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