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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9a4916d42879398a560e9d4c3d7cbc70f4c416b42c147db67daa697292e632' 
  AND token = '6CTqlvLH4mNujbW/Hk3cQ8fu7QHvVr5OeXdNvypZzCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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