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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f249b4510d412ea59bd84a17ee502ed93d4c20a7a1943689df519a6cf15bf0' 
  AND token = 'XT9VDrgO0mB00OLt2tYbHd55kgCbiZULyakd7Tq4X3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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