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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8604845f89321d473fea6af2e4e589535d46a838932d0f1f9fe913343352bf13' 
  AND token = 'MYTmHxbaT0TCIA/tPEBbmoKWA4Eij4JzQnh4ab0vL1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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