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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b804c6bf2eecfb749b503ad8319923c3b5b4e1b1e52bfdd584248a8ed2d7328' 
  AND token = 'RF6C4ey42X9xSz7MqM2zM4hEe7ky8JjWSmj4bu/rrjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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