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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265668e8ea25c94da05fca27f564605abc45176a56276a8d9aed8328ebf04cf1' 
  AND token = 'Z6TlufnArcAVA5DnVnNkAaAk32B4oNu+HSGui4Gme5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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