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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdce4549bf61ffe867741109bff5967566cef15890b38e7ef5552006fcf03f14' 
  AND token = 'neOOGUr2YuAD0lT68vyi84vRlx79WFuFP8D9sc6n0/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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