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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed3ba057f746e27eb0b990d47ce290fa82fea506e1a6e6679216bdd4f2e9f5b' 
  AND token = 'n6/MbrVa0gmWEV7/7nw32jlbU0zM2wnxRu0B69J13wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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