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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec85b3aadc966caa72da37ec60d0559bda83642a4a8cd156402789fa220c359b' 
  AND token = 'HhQgWXKUyinM7pp4dURyGnPIecE8wKR3bO4/2JhbwNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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