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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdfcafa5446ee8de4f0c66b16f89ad0f51087514dce98c754b2ca104c02467b' 
  AND token = 'SdQ1s/O6iLxLQJfg7amTtBWwYk+8vZu5GLBofd+xl4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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