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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b2551b1d463a4cea6326d192395a4e88b7728c6b58a110a9a3f26d6e81291a' 
  AND token = 'PVhMHzpwM38Vynpzyq3QDieQyZJTGo4ovTBKhD5ohG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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