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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72f4afeb4cd20b3c6701674240dae1135a9871fd8da19d2d93273a4883ef56f' 
  AND token = '/OXZUbm8IeAeUNWTEP50OgaQkUte4PHcrvY4Kz8/gLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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