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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e130adf86cac60698d1e2580203a0258372d60772e2ef2bf9b49749f0980b3d' 
  AND token = 'eGUt5xk5VUUJI/sspwsYh0r6tTPBJ/Ei5rIb/g0qIwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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