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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4e7769804fa5cb992bb38dd3cc56f7f63666a1060d3383c7acacf2cc8398bf' 
  AND token = 'aWltD3H68ozGbVXprzu+TKN77s38KrNPEUNLD7XB3J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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