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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a09cb33deeb080bf115bf97842d7ec1034a2133b606b4065b165760834bbfb8' 
  AND token = 'xcXI2599vgZs6QcQ+ikcSzfJZIhTUgmJE9IMbSPNvLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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