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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f967964cff1fb8cf874d19dd3d5ce220d469ceb6a5c33a57ed995189c77bff20' 
  AND token = 'gdMD0Ln9JlVglIzsiimnMd7xqW+tBI3koqmbLO0bm98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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