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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b25325cea54ec9185a251f5444d7717ca8d70ab70ecd195f74bdca854f9366d' 
  AND token = 'M3Wyj2bx4ho7tPe8CZUjuD3U3rke9Rlfsd+mGaH+sLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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