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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c5d01128d3aaa589872967aa407ffb8a96f35642d0cbd4a0f17570a500bd08' 
  AND token = 'UWy6YV5X2p16V6CDp9m3IWXqnuawtJz/3x4+/rJfgAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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