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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513bc055f68c0687a900cf12b53616e3e9fbe4fcd8683835e55a1090f9d345fe' 
  AND token = 'Ty1J7X07ddLxzbHY7LUyaQUiSk9fGlg3C8+aSOuYkhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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