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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73a2688096d2e9ef4872b73b34190d1e4767dabc40e905260c53c0e5d8866b7' 
  AND token = 'kh2fFO1cNbPyVIPMae7nyVRrgyeM+wEaud7y1oVhtvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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